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In Reply to: RE: Metal cased tubes posted by TubeAcolyte on March 24, 2014 at 06:39:09
I think that you have hit the nail on the head -
Better reliability, smaller envelope, and war time use...
I'll look back on some samples of 1614 power tubes that I have from a pair of old MC-30s - IIRC the envelope was evacuated through the glass base...But That could be incorrect...
Happy listening
Follow Ups:
Underneath that metal is glass, my friends...the metal is like a shielding and protective turtle shell...
You may be getting confused between the steel-shelled tubes which have the glass base and aluminium cased types such as EF50 which had an all-glass type enclosed within a metal shell
Al
but the old octal style base metal tubes have glass only at the base.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
.
Have Fun and Enjoy the Music
"Still Working the Problem"
"Underneath that metal is glass..."
Not true of the 6sh7 I just destroyed.
The only glass is at the base. The rest of the envelop is just metal.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre is correct, in fact not long ago someone posted a link to a You Tube video on how tubes are made and it featured metal shell tubes. No glass guys!
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